unsubscribe emails

Why are we still seeing emails with "unsubscribe" subjects on the lists?
I thought we had a filter to auto-reply to them.

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----- Forwarded message from Bill Hernandez -----

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Message-ID: <7D4D50A9-6A46-4DE0-94F6-2593084BCB7A(at)mac-specialist(dot)com>
To: pgsql-admin(at)postgresql(dot)org
From: Bill Hernandez <pgsql(at)mac-specialist(dot)com>
Subject: [ADMIN] unsubscribe
Date: Thu, 14 Dec 2006 09:28:30 -0600
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unsubscribe

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----- End of forwarded message from Bill Hernandez -----

--
Bruce Momjian bruce(at)momjian(dot)us
EnterpriseDB http://www.enterprisedb.com

+ If your life is a hard drive, Christ can be your backup. +